swift 3 : How to have a "global" button and action used in multiple controllers

Question

假设我有 20 个 View Controller ，它们都需要相同的按钮和操作，有没有办法避免在每个 Controller 中实现相同的 ibaction？我应该用我的操作子类化 UIViewController 然后将我的 Controller 基于该子类吗？或者还有其他方法吗？

Answer 1

我最终遵循了此处概述的基于协议(protocol)/值(value)的方法 -> subclassing-can-suck-and-heres-why

在我的例子中，我有一个位于多个 View 上的“设置”按钮。

protocol SettingsButtonRenderer {
    func goToSettings()
}

extension SettingsButtonRenderer where Self: UIViewController {
    func goToSettings() {
        let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
        let settingsNavigationController = storyBoard.instantiateViewController(withIdentifier: "SettingsNavigationController")
        present(settingsNavigationController, animated: true, completion: nil)
     }
}

class DeliveryTabViewController: UIViewController, SettingsButtonRenderer {

    @IBOutlet weak var goToSettingBtn: UIBarButtonItem!

    override func viewDidLoad() {
        super.viewDidLoad()
        goToSettingBtn.target = self
        goToSettingBtn.action = #selector(DeliveryTabViewController.settingsClicked as (DeliveryTabViewController) -> () -> ())
    }

    func settingsClicked() {
        goToSettings()
    }
}